Er^(3+)单掺、Er^(3+)/Yb^(3+)共掺杂Ca_(12)Al_(14)O_(32)F_2的制备及上转换发光性质  

Synthesis and Luminescence Properties of Er^(3+) Doped and Er^(3+)-Yb^(3+) Co-doped Ca_(12)Al_(14)O_(32)F_2

作　　者：刘秀玲 郭艳艳[1] 米晓云[1] 张希艳[1] LIU Xiu-ling;GUO Yan-yan;MI Xiao-yun;ZHANG Xi-yan(School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, China)

机构地区：[1]长春理工大学材料科学与工程学院,吉林长春130022

出　　处：《发光学报》2019年第5期589-594,共6页Chinese Journal of Luminescence

基　　金：国家自然科学基金青年基金(21501167;51502022;);吉林省教育厅"十三五"科学技术研究项目(JJKH20181093KJ;2015-55;JJKH20181121KJ);长春理工大学青年科学基金(XQNJJ-2014-12);吉林省科技厅优秀青年人才基金(20190103007JH)资助项目~~

摘　　要：利用高温固相法成功制备了Er^(3+)单掺、Er^(3+)/Yb^(3+)共掺杂Ca_(12)Al_(14)O_(32)F_2上转换发光样品。在980 nm激光激发下,Er^(3+)单掺和Er^(3+)/Yb^(3+)共掺杂样品均呈现出较强的绿光(528,549 nm)和较弱的红光(655 nm)发射,分别归因于Er^(3+)离子的~2H_(11/2),~4S_(3/2)→~4I_(15/2)和~4F_(9/2)→~4I_(15/2)能级跃迁。随着Er离子浓度的增加,单掺杂样品上转换发光强度先增大后减小,最佳掺杂浓度为0.8%。共掺杂Yb^(3+)后,Er^(3+)的发光强度明显增大。还原气氛下合成的样品上转换发光强度增大约两倍,可能和笼中阴离子基团变化有关。发光强度和激发光功率的关系表明所得上转换发射为双光子吸收过程,借助Er^(3+)-Yb^(3+)体系能级结构详细讨论了上转换发射的跃迁机制。Er ^3+ doped and Er ^3+-Yb ^3+ co-doped Ca 12 Al 14 O 32 F 2 were synthesized by solid-state reaction method at 1 250 o C and the upconversion luminescence (UCL) properties of the phosphor were studied under 980 nm excitation. The phosphor exhibits green (549 nm) and red (655 nm) emission, which corresponding to ^4S 3/2 ,^2H 11/2 →^4I 15/ 2 and ^4F 9/2 → 4I 15/2 transitions of Er ^3+ respectively. The UCL intensity of the single doped sample increased firstly and then decreased with the increasing Er ^3+ concentration and the optimum concentration is 0.8%. The UCL intensity of Ca 12 Al 14 O 32 F 2 ∶Er ^3+,Yb ^3+ prepared in reducing atmosphere is enhanced by 2 times, which might be due to the encaged ions. The dependence of the UCL intensity on excitation powder proves that the observed emissions are obtained via two absorption processes. The transition mechanism of phosphor excitation under 980 nm is discussed in detail.

关 键 词：ER^3+ Ca12Al14O32F2 高温固相法 上转换发光 

分 类 号：O734.3[理学—晶体学]